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Colouring Oxides

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Colouring Oxides, product summary

These are raw pigments from which prepared colours and stains are compounded.
Oxides may be painted directly onto clay, biscuit or unfired glazed ware or used as stains for bodies and glazes, producing the characteristic colours as described.

Remember to wear a mask when using the oxides in dry form

Manganese Compounds give brown colours in glazes. Pink, purple or plum colours can be obtained in alkaline glazes. When mixed with iron, Manganese compounds produce brown and when mixed with cobalt produce violet.
Iron compounds generally give a wide range of colours ranging from honey yellow, brownish reds, brown, black, yellow and purple depending on the firing conditions. Under reduction, a blue colour can be obtained.

Details of sample preparation

COLOURING OXIDES

We pressed a wooden Indian printing block into soft buff clay to create texture and interest and used a square tile cutter to produce crisp samples.

These were dried out slowly to prevent warping and biscuit fired to 1000 deg cent.

A small quantity of oxides were mixed with water and brushed on to stain the tile with a hake and then left to dry for 30 minutes.

The oxide was then removed from the high points with a wet sponge and glazed with Potterycrafts Ltd P2048 on the right side diagonal and fired to 1230 deg cent.

Safety Data - fact sheets are available for one or more of these product items

HO2
Chromium Oxide

Normally green in colour but in some lead glazes will give red and yellow. Pink is produced in the presence of tin oxide. Normally additions of 1-3% is used. Adding 1% to low firing glazes with a soda content gives a brilliant yellow.

100gm

500gm

1kg

5kg

. . .

£10.00

£19.00

. . .

. . .

. . .

HO3
Cobalt Carbonate

A weaker form of Cobalt Oxide but gives less risk of specking. 1 to 3% to obtain a blue glaze.

100gm

500gm

1kg

5kg

£12.00

£42.00

£75.00

. . .

. . .

. . .

HO4
Cobalt Oxide

The most powerful colouring oxide. It produces a deep blue or blue black colour in lead and leadless glazes and a vivid blue in alkaline glazes. Adding magnesium gives a more purple colour. 1 to 1.5% for a deep blue black glaze.

100gm

500gm

1kg

5kg

£13.00

£47.00

£86.00

. . .

. . .

. . .

HO5
Copper Carbonate

A weaker form of Copper oxide but gives less risk of specking.

100gm

500gm

1kg

5kg

£3.50

£12.00

£20.00

. . .

. . .

. . .

HO6
Copper Oxide

A transparent green under normal neutral or oxidising conditions, except in alkaline glazes then a turquoise blue is obtained. Under reduction conditions a copper red colour is obtained often referred to as ox blood or sang-de-boeuf. When copper is added to low solubility glazes it causes the solubility of the lead to be greatly increase and therefore, making the glaze not food safe.

100gm

500gm

1kg

5kg

£3.00

£11.00

£20.00

. . .

. . .

. . .

HO7
Iron Oxide Black

4 to 8% gives darker shades than red iron oxide.

100gm

500gm

1kg

5kg

. . .

£4.50

£7.00

£25.00

. . .

. . .

HO8
Iron Oxide Red Natural

2 to 10% produces even shades ranging from ambers to brown.

100gm

500gm

1kg

5kg

. . .

£3.50

£5.00

£18.00

. . .

. . .

HO9
Iron Oxide Spangles

1 to 5% produces dark browns and speckles.

100gm

500gm

1kg

5kg

. . .

£5.00

£7.00

£25.00

. . .

. . .

HO10
Iron Oxide Yellow

3 to 8% produces browns and honey yellows in glazes.

100gm

500gm

1kg

5kg

. . .

£4.00

£6.00

£23.00

. . .

. . .

HO11
Manganese Carbonate

0.2% to 5% gives pink to brown colours.

100gm

500gm

1kg

5kg

. . .

£5.00

£7.50

£26.00

. . .

. . .

HO12
Manganese Dioxide, Fine

0.2 to 5% gives pink to brown colours.

100gm

500gm

1kg

5kg

. . .

£3.50

£5.00

£16.00

. . .

. . .

HO14
Vanadium Pentoxide

Up to 10% addition gives a weak yellow as a stain. Can be used at higher temperatures than Antimony, giving a stronger colour when used in conjunction with tin.

100gm

500gm

1kg

5kg

£12.00

£50.00

£86.00

. . .

. . .

. . .

HO1
Antimony Oxide

Additions of 1 to 2% to a high leaded glaze gives the characteristic Naples Yellow.

100gm

500gm

1kg

5kg

£3.00

£8.00

£15.00

. . .

. . .

. . .

HO15
Iron Purple Oxide (Crocus Martis)

Speckled effects can be obtained with crocus martis. Warm colours obtained in lead glazes and cooler ones in lead free and alkaline glazes especially. Mottled creams can be obtained in the presence of tin. The final colour obtained with iron oxide varies with the type of glaze, firing temperature and kiln atmosphere. A soluble form of iron and a substitute for red iron oxide.

100gm

500gm

1kg

5kg

. . .

£5.50

£8.00

£32.00

. . .

. . .

HO13
Nickel Oxide Black

1 to 3% gives brownish greens to grey. In high zinc content stoneware glazes a yellow or blue is obtained under reduction firing.